Flash Flood Warning 12, NWS Salt Lake City, UT

840 
WGUS75 KSLC 252338
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
538 PM MDT FRI JUL 25 2014

UTC025-053-260100-
/O.CON.KSLC.FF.W.0012.000000T0000Z-140726T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-KANE UT-
538 PM MDT FRI JUL 25 2014

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 PM MDT FOR
EAST CENTRAL WASHINGTON AND WEST CENTRAL KANE COUNTIES...

AT 535 PM MDT...DOPPLER RADAR INDICATED THUNDERSTORMS HAD PRODUCED 
HEAVY RAIN ACROSS THE SOUTHERN PORTION OF ZION NATIONAL PARK. THE 
STORMS HAVE WEAKENED...BUT FLOODING REMAINS POSSIBLE. 

OFFICIALS AT ZION NATIONAL PARK INDICATE THAT SLICKROCK DRAINAGES 
WITHIN THE PARK ARE FLOWING.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
NORTH CREEK...LITTLE CREEK...AND THE NORTH FORK OF THE VIRGIN RIVER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

&&

LAT...LON 3736 11279 3711 11293 3720 11320 3742 11307

$$

MT

489 
WGUS75 KSLC 260051
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
651 PM MDT FRI JUL 25 2014

UTC025-053-260100-
/O.EXP.KSLC.FF.W.0012.000000T0000Z-140726T0100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-KANE UT-
651 PM MDT FRI JUL 25 2014

...THE FLASH FLOOD WARNING FOR EAST CENTRAL WASHINGTON AND WEST
CENTRAL KANE COUNTIES WILL EXPIRE AT 700 PM MDT...

THE HEAVY RAIN OVER SOUTHERN PORTIONS OF ZION NATIONAL PARK HAS 
DIMINISHED...AND FLOODING IS NO LONGER EXPECTED TO POSE A THREAT. 

LAT...LON 3736 11279 3711 11293 3720 11320 3742 11307

$$

MT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
346 PM MDT FRI JUL 25 2014

.SYNOPSIS...A STALLED FRONT WILL REMAIN ACROSS CENTRAL UTAH
THROUGH FRIDAY MAINTAINING MOISTURE ACROSS THE SOUTH AND DRIER
AIR ACROSS THE NORTH. THIS MOISTURE WILL SLOWLY WORK ITS WAY
NORTHWARD DURING THE UPCOMING WEEKEND AND REMAIN IN PLACE INTO
EARLY NEXT WEEK.

&&

.DISCUSSION...AFTERNOON ANALYSIS INDICATES A NEARLY STATIONARY
FRONT DIVIDING THE STATE FROM ROUGHLY GANDY TO UTAH COUNTY TO THE
UINTA BASIN. SOUTH OF THIS BOUNDARY...SUFFICIENT MOISTURE REMAINS
TO ALLOW FOR THE DEVELOPMENT OF CONVECTION. STORM MOTIONS ARE
FAIRLY DECENT TODAY BUT TRAINING OF CELLS OR COLLISIONS OF OUTFLOW
BOUNDARIES/CELL MERGERS COULD HELP TO PRODUCE FLASH FLOODING IN
THE MORE FLOOD PRONE AREAS OF SOUTHERN UTAH INCLUDING NORMALLY DRY
WASHES...SLICK ROCK AREAS AND SMALL STREAMS IN STEEP TERRAIN.
NORTH OF THE BOUNDARY...DRY AND COOLER CONDITIONS REMAIN IN PLACE.

THIS BOUNDARY WILL FURTHER WEAKEN OVERNIGHT. THE DEEPEST MOISTURE
WILL REMAIN SOUTH OF THE WEAKENED BOUNDARY AGAIN SATURDAY. AN
UPPER LEVEL LOW DIVING SOUTH ACROSS THE UPPER MIDWEST WILL HELP TO
AMPLIFY THE RIDGE ACROSS THE WESTERN UNITED STATES. THIS WILL HELP
TO BRING DEEPER MOISTURE NORTHWARD SUNDAY AFTERNOON.

A DISTURBANCE MOVING NORTH ON THE WESTERN PERIPHERY OF THE RIDGE
WILL HELP TO INCREASE THE THREAT OF CONVECTION MONDAY AFTERNOON
INTO TUESDAY. HAVE INCREASED POPS TO COINCIDE WITH THIS INCREASE
IN LIFT ACROSS THE AREA MONDAY AFTERNOON INTO TUESDAY AFTERNOON.
EXPECT SUBSIDENCE IN THE WAKE OF THIS DISTURBANCE FOR MANY AREAS
WEDNESDAY.

FOR THE FORECAST BEYOND WEDNESDAY...SMALL DIFFERENCES BETWEEN
MODELS HAVE A FAIRLY LARGE IMPACT ON THE DEGREE OF MOISTURE IN THE
AREA...AND THUS CONFIDENCE IN THE FORECAST PAST WEDNESDAY IS
FAIRLY LOW AT THIS TIME GIVEN MODEL TO MODEL VARIANCE.

&&

.AVIATION...VFR CONDITIONS ARE EXPECTED THROUGHOUT THE EVENING AT
THE SLC TERMINAL WITH SOME SCATTERED CLOUDS. NORTHWEST WINDS ARE
EXPECTED TO SHIFT TO THE SOUTHEAST BETWEEN 03Z AND 05Z.

&&

.FIRE WEATHER...A STATIONARY SURFACE BOUNDARY REMAINS DRAPED ACROSS
CENTRAL UTAH THIS AFTERNOON AND DELINEATES MORE STABLE AND DRY AIR
TO THE NORTH AND DEEPER MOISTURE TO THE SOUTH. WESTERN VALLEYS HAVE
BEEN HITTING RED FLAG CRITERIA THIS AFTERNOON DUE TO BONE DRY
SURFACE CONDITIONS AND GUSTY SOUTHERLY WINDS AND A RED FLAG WARNING
REMAINS IN EFFECT THROUGH THIS EVENING.

HAVE NOTED SCATTERED SHOWER AND THUNDERSTORM DEVELOPED TODAY WITH
FOCUS ACROSS CENTRAL AND EASTERN UTAH...MORE ISOLATED ACROSS
CENTRAL UTAH WHERE A FEW DRY THUNDERSTORMS ARE POSSIBLE INTO THIS
EVENING. DECIDED TO ISSUE A FIRE WEATHER WATCH FOR ZONE 492 IN
WEST CENTRAL UTAH FOR TOMORROW AFTERNOON/EVE AS AREAL COVERAGE OF
MOSTLY DRY THUNDERSTORMS IS EXPECTED TO INCREASE SLIGHTLY. THIS
THREAT COULD CONTINUE ACROSS ZONE 492 AND POSSIBLY PORTIONS OF 478
ON SUNDAY BUT SURFACE MOISTURE SHOULD ALLOW STORMS TO TREND MORE
WET BY THAT TIME. WILL CONTINUE TO MONITOR THIS THREAT CLOSELY.

AN UPPER LEVEL FEATURE WILL TRACK ACROSS WESTERN UTAH MONDAY
SPREADING DEEP MOISTURE TO ALL AREAS...AND ALLOWING FOR A GREATER
WETTING RAIN POTENTIAL WITH STORM ACTIVITY AT THAT TIME.

WINDS AFTER TODAY WILL TREND LIGHTER AS FLOW ALOFT DECREASES LATER
TOMORROW INTO EARLY NEXT WEEK. OUTSIDE OF LOCALIZED AREAS LIGHT
DIURNALLY DRIVEN SLOPE FLOWS LOOK TO BE THE NORM.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...RED FLAG WARNING UNTIL 9 PM MDT THIS EVENING FOR UTZ492-495.

     FIRE WEATHER WATCH FROM SATURDAY AFTERNOON THROUGH SATURDAY
     EVENING FOR UTZ492.

WY...NONE.
&&

KRUSE/MERRILL/TRAPHAGAN

FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)

FOR FREQUENTLY ASKED QUESTIONS ABOUT THE AREA FORECAST DISCUSSION
VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY/GENERAL/AFD_FAQS.PHP (ALL LOWER CASE)

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
546 AM MDT FRI JUL 25 2014

UTZ001>016-019>021-517-518-WYZ021-261200-
CACHE VALLEY/UTAH PORTION-NORTHERN WASATCH FRONT-
SALT LAKE AND TOOELE VALLEYS-SOUTHERN WASATCH FRONT-
GREAT SALT LAKE DESERT AND MOUNTAINS-WASATCH MOUNTAIN VALLEYS-
WASATCH MOUNTAINS I-80 NORTH-WASATCH MOUNTAINS SOUTH OF I-80-
WESTERN UINTA MOUNTAINS-WASATCH PLATEAU/BOOK CLIFFS-
WESTERN UINTA BASIN-CASTLE COUNTRY-SAN RAFAEL SWELL-
SANPETE/SEVIER VALLEYS-WEST CENTRAL UTAH-SOUTHWEST UTAH-
UTAHS DIXIE AND ZION NATIONAL PARK-SOUTH CENTRAL UTAH-
GLEN CANYON RECREATION AREA/LAKE POWELL-CENTRAL MOUNTAINS-
SOUTHERN MOUNTAINS-SOUTHWEST WYOMING-
546 AM MDT FRI JUL 25 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN TWO THIRDS OF
UTAH AND SOUTHWEST WYOMING.

.DAY ONE...TODAY AND TONIGHT

GUSTY SOUTH WINDS COMBINED WITH LOW HUMIDITY WILL RESULT IN
CRITICAL FIRE WEATHER CONDITIONS THIS AFTERNOON AND EARLY EVENING
ACROSS WEST CENTRAL AND SOUTHWEST UTAH.

MONSOON MOISTURE ACROSS PORTIONS OF SOUTHERN AND CENTRAL UTAH WILL
BRING A CHANCE FOR SHOWERS AND THUNDERSTORMS THIS
AFTERNOON...MAINLY ALONG AND EAST OF I-15. DANGEROUS
LIGHTNING...STRONG GUSTY WINDS...AND BRIEF HEAVY RAIN CAN BE
EXPECTED WITH ANY STORMS WHICH DEVELOP.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

MOISTURE WILL SLOWLY SPREAD NORTHWARD SATURDAY INTO SUNDAY ACROSS
THE REMAINDER OF THE OUTLOOK AREA...BRINGING AN INCREASED THREAT
FOR SHOWERS AND THUNDERSTORMS AREAWIDE INTO EARLY NEXT WEEK...WITH
AN INCREASING RISK OF HEAVY RAINFALL AND LOCAL FLASH FLOODING.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

FOR MORE INFORMATION FROM NOAA/S NATIONAL WEATHER SERVICE VISIT...
HTTP://WEATHER.GOV/SALTLAKECITY/ (ALL LOWER CASE)

FOR INFORMATION ON POTENTIAL ROAD TRAVEL IMPACTS VISIT...
HTTP://WWW.UDOTTRAFFIC.UTAH.GOV/ROADWEATHERFORECAST.ASPX